* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
- * InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
- * E-mail:
- * <brain@chatspike.net>
- * <Craig@chatspike.net>
- *
- * Written by Craig Edwards, Craig McLure, and others.
+ * InspIRCd: (C) 2002-2007 InspIRCd Development Team
+ * See: http://www.inspircd.org/wiki/index.php/Credits
+ *
* This program is free but copyrighted software; see
- * the file COPYING for details.
+ * the file COPYING for details.
*
* ---------------------------------------------------
*/
+/* $Core: libIRCDasyncdns */
+
/*
dns.cpp - Nonblocking DNS functions.
Very very loosely based on the firedns library,
looks like this, walks like this or tastes like this.
*/
-using namespace std;
-
+#ifndef WIN32
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <netinet/in.h>
#include <arpa/inet.h>
+#else
+#include "inspircd_win32wrapper.h"
+#include "inspircd_se_config.h"
+#endif
+
#include "dns.h"
#include "inspircd.h"
#include "socketengine.h"
#include "configreader.h"
#include "socket.h"
-using namespace std;
-using irc::sockets::insp_sockaddr;
using irc::sockets::insp_inaddr;
using irc::sockets::insp_ntoa;
using irc::sockets::insp_aton;
+using irc::sockets::OpenTCPSocket;
/** Masks to mask off the responses we get from the DNSRequest methods
*/
/** Represents a dns resource record (rr)
*/
-class ResourceRecord
+struct ResourceRecord
{
- public:
QueryType type; /* Record type */
unsigned int rr_class; /* Record class */
unsigned long ttl; /* Time to live */
class DNSRequest
{
public:
- unsigned char id[2]; /* Request id */
- unsigned char* res; /* Result processing buffer */
+ unsigned char id[2]; /* Request id */
+ unsigned char* res; /* Result processing buffer */
unsigned int rr_class; /* Request class */
- QueryType type; /* Request type */
- insp_inaddr myserver; /* DNS server address*/
- DNS* dnsobj; /* DNS caller (where we get our FD from) */
+ QueryType type; /* Request type */
+ DNS* dnsobj; /* DNS caller (where we get our FD from) */
+ unsigned long ttl; /* Time to live */
+ std::string orig; /* Original requested name/ip */
+ InspIRCd* ServerInstance;
- DNSRequest(InspIRCd* Instance, DNS* dns, insp_inaddr server, int id, requestlist &requests);
+ DNSRequest(InspIRCd* Instance, DNS* dns, int id, const std::string &original);
~DNSRequest();
- DNSInfo ResultIsReady(DNSHeader &h, int length);
+ DNSInfo ResultIsReady(DNSHeader &h, int length, int result_we_want);
int SendRequests(const DNSHeader *header, const int length, QueryType qt);
};
-class RequestTimeout : public InspTimer
+class CacheTimer : public Timer
+{
+ private:
+ InspIRCd* ServerInstance;
+ DNS* dns;
+ public:
+ CacheTimer(InspIRCd* Instance, DNS* thisdns)
+ : Timer(3600, Instance->Time(), true), ServerInstance(Instance), dns(thisdns) { }
+
+ virtual void Tick(time_t)
+ {
+ dns->PruneCache();
+ }
+};
+
+class RequestTimeout : public Timer
{
InspIRCd* ServerInstance;
DNSRequest* watch;
int watchid;
- requestlist &rl;
public:
- RequestTimeout(unsigned long n, InspIRCd* SI, DNSRequest* watching, int id, requestlist &requests) : InspTimer(n, time(NULL)), ServerInstance(SI), watch(watching), watchid(id), rl(requests)
+ RequestTimeout(unsigned long n, InspIRCd* SI, DNSRequest* watching, int id) : Timer(n, time(NULL)), ServerInstance(SI), watch(watching), watchid(id)
{
- ServerInstance->Log(DEBUG, "New DNS timeout set on %08x", watching);
}
- void Tick(time_t TIME)
+ void Tick(time_t)
{
- if (rl.find(watchid) != rl.end())
+ if (ServerInstance->Res->requests[watchid] == watch)
{
/* Still exists, whack it */
- if (rl.find(watchid)->second == watch)
+ if (ServerInstance->Res->Classes[watchid])
{
- if (ServerInstance->Res->Classes[watchid])
- {
- ServerInstance->Res->Classes[watchid]->OnError(RESOLVER_TIMEOUT, "Request timed out");
- delete ServerInstance->Res->Classes[watchid];
- ServerInstance->Res->Classes[watchid] = NULL;
- }
- rl.erase(rl.find(watchid));
- delete watch;
- ServerInstance->Log(DEBUG, "DNS timeout on %08x squished pointer", watch);
+ ServerInstance->Res->Classes[watchid]->OnError(RESOLVER_TIMEOUT, "Request timed out");
+ delete ServerInstance->Res->Classes[watchid];
+ ServerInstance->Res->Classes[watchid] = NULL;
}
+ ServerInstance->Res->requests[watchid] = NULL;
+ delete watch;
return;
}
- ServerInstance->Log(DEBUG, "DNS timeout on %08x: result already received!", watch);
}
};
/* Allocate the processing buffer */
-DNSRequest::DNSRequest(InspIRCd* Instance, DNS* dns, insp_inaddr server, int id, requestlist &requests) : dnsobj(dns)
+DNSRequest::DNSRequest(InspIRCd* Instance, DNS* dns, int id, const std::string &original) : dnsobj(dns), ServerInstance(Instance)
{
res = new unsigned char[512];
*res = 0;
- memcpy(&myserver, &server, sizeof(insp_inaddr));
- RequestTimeout* RT = new RequestTimeout(Instance->Config->dns_timeout ? Instance->Config->dns_timeout : 5, Instance, this, id, requests);
+ orig = original;
+ RequestTimeout* RT = new RequestTimeout(Instance->Config->dns_timeout ? Instance->Config->dns_timeout : 5, Instance, this, id);
Instance->Timers->AddTimer(RT); /* The timer manager frees this */
}
/** Send requests we have previously built down the UDP socket */
int DNSRequest::SendRequests(const DNSHeader *header, const int length, QueryType qt)
{
- insp_sockaddr addr;
unsigned char payload[sizeof(DNSHeader)];
this->rr_class = 1;
DNS::EmptyHeader(payload,header,length);
- memset(&addr,0,sizeof(addr));
#ifdef IPV6
- memcpy(&addr.sin6_addr,&myserver,sizeof(addr.sin6_addr));
- addr.sin6_family = AF_FAMILY;
- addr.sin6_port = htons(DNS::QUERY_PORT);
-#else
- memcpy(&addr.sin_addr.s_addr,&myserver,sizeof(addr.sin_addr));
- addr.sin_family = AF_FAMILY;
- addr.sin_port = htons(DNS::QUERY_PORT);
+ if (this->dnsobj->socketfamily == AF_INET6)
+ {
+ sockaddr_in6 addr;
+ memset(&addr,0,sizeof(addr));
+ memcpy(&addr.sin6_addr,&dnsobj->myserver6,sizeof(addr.sin6_addr));
+ addr.sin6_family = AF_INET6;
+ addr.sin6_port = htons(DNS::QUERY_PORT);
+ if (ServerInstance->SE->SendTo(dnsobj, payload, length + 12, 0, (sockaddr *) &addr, sizeof(addr)) != length+12)
+ return -1;
+ }
+ else
#endif
- if (sendto(dnsobj->GetFd(), payload, length + 12, 0, (sockaddr *) &addr, sizeof(addr)) == -1)
- return -1;
-
+ {
+ sockaddr_in addr;
+ memset(&addr,0,sizeof(addr));
+ memcpy(&addr.sin_addr.s_addr,&dnsobj->myserver4,sizeof(addr.sin_addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(DNS::QUERY_PORT);
+ if (ServerInstance->SE->SendTo(dnsobj, (const char*)payload, length + 12, 0, (sockaddr *) &addr, sizeof(addr)) != length+12)
+ return -1;
+ }
return 0;
}
/** Add a query with a predefined header, and allocate an ID for it. */
-DNSRequest* DNS::AddQuery(DNSHeader *header, int &id)
+DNSRequest* DNS::AddQuery(DNSHeader *header, int &id, const char* original)
{
/* Is the DNS connection down? */
if (this->GetFd() == -1)
return NULL;
-
- /* Are there already the max number of requests on the go? */
- if (requests.size() == DNS::MAX_REQUEST_ID + 1)
- return NULL;
/* Create an id */
id = this->PRNG() & DNS::MAX_REQUEST_ID;
/* If this id is already 'in flight', pick another. */
- while (requests.find(id) != requests.end())
+ while (requests[id])
id = this->PRNG() & DNS::MAX_REQUEST_ID;
- DNSRequest* req = new DNSRequest(ServerInstance, this, this->myserver, id, requests);
+ DNSRequest* req = new DNSRequest(ServerInstance, this, id, original);
header->id[0] = req->id[0] = id >> 8;
header->id[1] = req->id[1] = id & 0xFF;
return req;
}
-/** Initialise the DNS UDP socket so that we can send requests */
-DNS::DNS(InspIRCd* Instance) : ServerInstance(Instance)
+int DNS::ClearCache()
{
- ServerInstance->Log(DEBUG,"DNS::DNS: Instance = %08x",Instance);
-
- insp_inaddr addr;
+ /* This ensures the buckets are reset to sane levels */
+ int rv = this->cache->size();
+ delete this->cache;
+ this->cache = new dnscache();
+ return rv;
+}
- /* Clear the Resolver class table */
- memset(Classes,0,sizeof(Classes));
+int DNS::PruneCache()
+{
+ int n = 0;
+ dnscache* newcache = new dnscache();
+ for (dnscache::iterator i = this->cache->begin(); i != this->cache->end(); i++)
+ /* Dont include expired items (theres no point) */
+ if (i->second.CalcTTLRemaining())
+ newcache->insert(*i);
+ else
+ n++;
- /* Set the id of the next request to 0
- */
- currid = 0;
+ delete this->cache;
+ this->cache = newcache;
+ return n;
+}
- /* By default we're not munging ip's
- */
+void DNS::Rehash()
+{
ip6munge = false;
+ int portpass = 0;
- /* Clear the namesever address */
- memset(&myserver,0,sizeof(insp_inaddr));
-
- /* Convert the nameserver address into an insp_inaddr */
- if (insp_aton(ServerInstance->Config->DNSServer,&addr) > 0)
+ if (this->GetFd() > -1)
{
- memcpy(&myserver,&addr,sizeof(insp_inaddr));
- if ((strstr(ServerInstance->Config->DNSServer,"::ffff:") == (char*)&ServerInstance->Config->DNSServer) || (strstr(ServerInstance->Config->DNSServer,"::FFFF:") == (char*)&ServerInstance->Config->DNSServer))
- {
- /* These dont come back looking like they did when they went in.
- * We're forced to turn some checks off.
- * If anyone knows how to fix this, let me know. --Brain
- */
- ServerInstance->Log(DEFAULT,"WARNING: Using IPv4 addresses over IPv6 forces some DNS checks to be disabled.");
- ServerInstance->Log(DEFAULT," This should not cause a problem, however it is recommended you migrate");
- ServerInstance->Log(DEFAULT," to a true IPv6 environment.");
- this->ip6munge = true;
- }
- ServerInstance->Log(DEBUG,"Added nameserver '%s'",ServerInstance->Config->DNSServer);
+ if (ServerInstance && ServerInstance->SE)
+ ServerInstance->SE->DelFd(this);
+ ServerInstance->SE->Shutdown(this, 2);
+ ServerInstance->SE->Close(this);
+ this->SetFd(-1);
+
+ /* Rehash the cache */
+ this->PruneCache();
}
else
{
- ServerInstance->Log(DEBUG,"GACK! insp_aton says the nameserver '%s' is invalid!",ServerInstance->Config->DNSServer);
+ /* Create initial dns cache */
+ this->cache = new dnscache();
}
- /* Initialize mastersocket */
- this->SetFd(socket(PF_PROTOCOL, SOCK_DGRAM, 0));
- if (this->GetFd() != -1)
+ if ((strstr(ServerInstance->Config->DNSServer,"::ffff:") == (char*)&ServerInstance->Config->DNSServer) || (strstr(ServerInstance->Config->DNSServer,"::FFFF:") == (char*)&ServerInstance->Config->DNSServer))
{
- /* Did it succeed? */
- if (fcntl(this->GetFd(), F_SETFL, O_NONBLOCK) != 0)
- {
- /* Couldn't make the socket nonblocking */
- shutdown(this->GetFd(),2);
- close(this->GetFd());
- this->SetFd(-1);
- }
+ ServerInstance->Log(DEFAULT,"WARNING: Using IPv4 addresses over IPv6 forces some DNS checks to be disabled.");
+ ServerInstance->Log(DEFAULT," This should not cause a problem, however it is recommended you migrate");
+ ServerInstance->Log(DEFAULT," to a true IPv6 environment.");
+ this->ip6munge = true;
+ }
+
+ this->socketfamily = AF_INET;
+#ifdef IPV6
+ if (strchr(ServerInstance->Config->DNSServer,':'))
+ {
+ this->socketfamily = AF_INET6;
+ inet_pton(AF_INET6, ServerInstance->Config->DNSServer, &this->myserver6);
}
else
{
- ServerInstance->Log(DEBUG,"I cant socket() this socket! (%s)",strerror(errno));
+ inet_aton(ServerInstance->Config->DNSServer, &this->myserver4);
+ portpass = -1;
}
+#else
+ inet_aton(ServerInstance->Config->DNSServer, &this->myserver4);
+#endif
+
+ /* Initialize mastersocket */
+ int s = OpenTCPSocket(ServerInstance->Config->DNSServer, SOCK_DGRAM);
+ this->SetFd(s);
+ ServerInstance->SE->NonBlocking(this->GetFd());
+
/* Have we got a socket and is it nonblocking? */
if (this->GetFd() != -1)
{
-#ifdef IPV6
- insp_sockaddr addr;
- memset(&addr,0,sizeof(addr));
- addr.sin6_family = AF_FAMILY;
- addr.sin6_port = 0;
- addr.sin6_addr = in6addr_any;
-#else
- insp_sockaddr addr;
- memset(&addr,0,sizeof(addr));
- addr.sin_family = AF_FAMILY;
- addr.sin_port = 0;
- addr.sin_addr.s_addr = INADDR_ANY;
-#endif
- /* Bind the port */
- if (bind(this->GetFd(),(sockaddr *)&addr,sizeof(addr)) != 0)
+ /* Bind the port - port 0 INADDR_ANY */
+ if (!ServerInstance->BindSocket(this->GetFd(), portpass, "", false))
{
/* Failed to bind */
- ServerInstance->Log(DEBUG,"Cant bind DNS fd");
- shutdown(this->GetFd(),2);
- close(this->GetFd());
+ ServerInstance->SE->Shutdown(this, 2);
+ ServerInstance->SE->Close(this);
this->SetFd(-1);
}
if (this->GetFd() >= 0)
{
- ServerInstance->Log(DEBUG,"Add master socket %d",this->GetFd());
/* Hook the descriptor into the socket engine */
if (ServerInstance && ServerInstance->SE)
{
if (!ServerInstance->SE->AddFd(this))
{
ServerInstance->Log(DEFAULT,"Internal error starting DNS - hostnames will NOT resolve.");
- shutdown(this->GetFd(),2);
- close(this->GetFd());
+ ServerInstance->SE->Shutdown(this, 2);
+ ServerInstance->SE->Close(this);
this->SetFd(-1);
}
}
}
}
+/** Initialise the DNS UDP socket so that we can send requests */
+DNS::DNS(InspIRCd* Instance) : ServerInstance(Instance)
+{
+ /* Clear the Resolver class table */
+ memset(Classes,0,sizeof(Classes));
+
+ /* Clear the requests class table */
+ memset(requests,0,sizeof(requests));
+
+ /* Set the id of the next request to 0
+ */
+ currid = 0;
+
+ /* DNS::Rehash() sets this to a valid ptr
+ */
+ this->cache = NULL;
+
+ /* Again, DNS::Rehash() sets this to a
+ * valid value
+ */
+ this->SetFd(-1);
+
+ /* Actually read the settings
+ */
+ this->Rehash();
+
+ this->PruneTimer = new CacheTimer(ServerInstance, this);
+
+ ServerInstance->Timers->AddTimer(this->PruneTimer);
+}
+
/** Build a payload to be placed after the header, based upon input data, a resource type, a class and a pointer to a buffer */
int DNS::MakePayload(const char * const name, const QueryType rr, const unsigned short rr_class, unsigned char * const payload)
{
if ((length = this->MakePayload(name, DNS_QUERY_A, 1, (unsigned char*)&h.payload)) == -1)
return -1;
- DNSRequest* req = this->AddQuery(&h, id);
+ DNSRequest* req = this->AddQuery(&h, id, name);
if ((!req) || (req->SendRequests(&h, length, DNS_QUERY_A) == -1))
return -1;
if ((length = this->MakePayload(name, DNS_QUERY_AAAA, 1, (unsigned char*)&h.payload)) == -1)
return -1;
- DNSRequest* req = this->AddQuery(&h, id);
+ DNSRequest* req = this->AddQuery(&h, id, name);
if ((!req) || (req->SendRequests(&h, length, DNS_QUERY_AAAA) == -1))
return -1;
if ((length = this->MakePayload(alias, DNS_QUERY_CNAME, 1, (unsigned char*)&h.payload)) == -1)
return -1;
- DNSRequest* req = this->AddQuery(&h, id);
+ DNSRequest* req = this->AddQuery(&h, id, alias);
if ((!req) || (req->SendRequests(&h, length, DNS_QUERY_CNAME) == -1))
return -1;
int length;
#ifdef IPV6
- DNS::MakeIP6Int(query, (in6_addr*)ip);
+ unsigned char* c = (unsigned char*)&ip->s6_addr;
+ if (c[0] == 0 && c[1] == 0 && c[2] == 0 && c[3] == 0 &&
+ c[4] == 0 && c[5] == 0 && c[6] == 0 && c[7] == 0 &&
+ c[8] == 0 && c[9] == 0 && c[10] == 0xFF && c[11] == 0xFF)
+ sprintf(query,"%d.%d.%d.%d.in-addr.arpa",c[15],c[14],c[13],c[12]);
+ else
+ DNS::MakeIP6Int(query, (in6_addr*)ip);
#else
unsigned char* c = (unsigned char*)&ip->s_addr;
-
sprintf(query,"%d.%d.%d.%d.in-addr.arpa",c[3],c[2],c[1],c[0]);
#endif
if ((length = this->MakePayload(query, DNS_QUERY_PTR, 1, (unsigned char*)&h.payload)) == -1)
return -1;
- DNSRequest* req = this->AddQuery(&h, id);
+ DNSRequest* req = this->AddQuery(&h, id, insp_ntoa(*ip));
if ((!req) || (req->SendRequests(&h, length, DNS_QUERY_PTR) == -1))
return -1;
return -1;
}
- ServerInstance->Log(DEBUG,"DNS::GetNameForce: %s %d",query, fp);
-
if ((length = this->MakePayload(query, DNS_QUERY_PTR, 1, (unsigned char*)&h.payload)) == -1)
return -1;
- DNSRequest* req = this->AddQuery(&h, id);
+ DNSRequest* req = this->AddQuery(&h, id, ip);
if ((!req) || (req->SendRequests(&h, length, DNS_QUERY_PTR) == -1))
return -1;
}
/** Return the next id which is ready, and the result attached to it */
-DNSResult DNS::GetResult()
+DNSResult DNS::GetResult(int resultnum)
{
/* Fetch dns query response and decide where it belongs */
DNSHeader header;
DNSRequest *req;
unsigned char buffer[sizeof(DNSHeader)];
- sockaddr from;
- socklen_t x = sizeof(from);
- const char* ipaddr_from = "";
+ sockaddr* from = new sockaddr[2];
+#ifdef IPV6
+ socklen_t x = this->socketfamily == AF_INET ? sizeof(sockaddr_in) : sizeof(sockaddr_in6);
+#else
+ socklen_t x = sizeof(sockaddr_in);
+#endif
+ const char* ipaddr_from;
unsigned short int port_from = 0;
- int length = recvfrom(this->GetFd(),buffer,sizeof(DNSHeader),0,&from,&x);
-
- if (length < 0)
- ServerInstance->Log(DEBUG,"Error in recvfrom()! (%s)",strerror(errno));
+ int length = ServerInstance->SE->RecvFrom(this, (char*)buffer, sizeof(DNSHeader), 0, from, &x);
/* Did we get the whole header? */
if (length < 12)
{
/* Nope - something screwed up. */
- ServerInstance->Log(DEBUG,"Whole header not read!");
- return std::make_pair(-1,"");
+ delete[] from;
+ return DNSResult(-1,"",0,"");
}
/* Check wether the reply came from a different DNS
* -- Thanks jilles for pointing this one out.
*/
#ifdef IPV6
- ipaddr_from = insp_ntoa(((sockaddr_in6*)&from)->sin6_addr);
- port_from = ntohs(((sockaddr_in6*)&from)->sin6_port);
-#else
- ipaddr_from = insp_ntoa(((sockaddr_in*)&from)->sin_addr);
- port_from = ntohs(((sockaddr_in*)&from)->sin_port);
+ char nbuf[MAXBUF];
+ if (this->socketfamily == AF_INET6)
+ {
+ ipaddr_from = inet_ntop(AF_INET6, &((sockaddr_in6*)from)->sin6_addr, nbuf, sizeof(nbuf));
+ port_from = ntohs(((sockaddr_in6*)from)->sin6_port);
+ }
+ else
#endif
+ {
+ ipaddr_from = inet_ntoa(((sockaddr_in*)from)->sin_addr);
+ port_from = ntohs(((sockaddr_in*)from)->sin_port);
+ }
+
+ delete[] from;
/* We cant perform this security check if you're using 4in6.
* Tough luck to you, choose one or't other!
{
if ((port_from != DNS::QUERY_PORT) || (strcasecmp(ipaddr_from, ServerInstance->Config->DNSServer)))
{
- ServerInstance->Log(DEBUG,"port %d is not 53, or %s is not %s",port_from, ipaddr_from, ServerInstance->Config->DNSServer);
- return std::make_pair(-1,"");
+ return DNSResult(-1,"",0,"");
}
}
unsigned long this_id = header.id[1] + (header.id[0] << 8);
/* Do we have a pending request matching this id? */
- requestlist_iter n_iter = requests.find(this_id);
- if (n_iter == requests.end())
+ if (!requests[this_id])
{
/* Somehow we got a DNS response for a request we never made... */
- ServerInstance->Log(DEBUG,"DNS: got a response for a query we didnt send with fd=%d queryid=%d",this->GetFd(),this_id);
- return std::make_pair(-1,"");
+ return DNSResult(-1,"",0,"");
}
else
{
/* Remove the query from the list of pending queries */
- req = (DNSRequest*)n_iter->second;
- requests.erase(n_iter);
+ req = requests[this_id];
+ requests[this_id] = NULL;
}
/* Inform the DNSRequest class that it has a result to be read.
* When its finished it will return a DNSInfo which is a pair of
* unsigned char* resource record data, and an error message.
*/
- DNSInfo data = req->ResultIsReady(header, length);
+ DNSInfo data = req->ResultIsReady(header, length, resultnum);
std::string resultstr;
/* Check if we got a result, if we didnt, its an error */
* an error response and needs to be treated uniquely.
* Put the error message in the second field.
*/
+ std::string ro = req->orig;
delete req;
- return std::make_pair(this_id | ERROR_MASK, data.second);
+ return DNSResult(this_id | ERROR_MASK, data.second, 0, ro);
}
else
{
+ unsigned long ttl = req->ttl;
char formatted[128];
/* Forward lookups come back as binary data. We must format them into ascii */
case DNS_QUERY_AAAA:
{
- snprintf(formatted,40,"%x:%x:%x:%x:%x:%x:%x:%x",
- (ntohs(data.first[0]) + ntohs(data.first[1] << 8)),
- (ntohs(data.first[2]) + ntohs(data.first[3] << 8)),
- (ntohs(data.first[4]) + ntohs(data.first[5] << 8)),
- (ntohs(data.first[6]) + ntohs(data.first[7] << 8)),
- (ntohs(data.first[8]) + ntohs(data.first[9] << 8)),
- (ntohs(data.first[10]) + ntohs(data.first[11] << 8)),
- (ntohs(data.first[12]) + ntohs(data.first[13] << 8)),
- (ntohs(data.first[14]) + ntohs(data.first[15] << 8)));
+ inet_ntop(AF_INET6, data.first, formatted, sizeof(formatted));
char* c = strstr(formatted,":0:");
if (c != NULL)
{
* as the last parameter on the line with a value ":1".
*/
if (*formatted == ':')
- resultstr = "0" + resultstr;
+ resultstr.insert(0, "0");
}
break;
break;
default:
- ServerInstance->Log(DEBUG,"WARNING: Somehow we made a request for a DNS_QUERY_PTR4 or DNS_QUERY_PTR6, but these arent real rr types!");
break;
}
/* Build the reply with the id and hostname/ip in it */
+ std::string ro = req->orig;
delete req;
- return std::make_pair(this_id,resultstr);
+ return DNSResult(this_id,resultstr,ttl,ro);
}
}
/** A result is ready, process it */
-DNSInfo DNSRequest::ResultIsReady(DNSHeader &header, int length)
+DNSInfo DNSRequest::ResultIsReady(DNSHeader &header, int length, int result_we_want)
{
int i = 0;
int q = 0;
int curanswer, o;
ResourceRecord rr;
unsigned short ptr;
-
+
+ /* This is just to keep _FORTIFY_SOURCE happy */
+ rr.type = DNS_QUERY_NONE;
+ rr.rdlength = 0;
+ rr.ttl = 1; /* GCC is a whiney bastard -- see the XXX below. */
+
if (!(header.flags1 & FLAGS_MASK_QR))
return std::make_pair((unsigned char*)NULL,"Not a query result");
if (length - i < 10)
return std::make_pair((unsigned char*)NULL,"Incorrectly sized DNS reply");
- DNS::FillResourceRecord(&rr,&header.payload[i]);
+ /* XXX: We actually initialise 'rr' here including its ttl field */
+ if (curanswer == result_we_want)
+ DNS::FillResourceRecord(&rr,&header.payload[i]);
+
i += 10;
if (rr.type != this->type)
{
break;
}
if ((unsigned int)curanswer == header.ancount)
- return std::make_pair((unsigned char*)NULL,"No valid answers");
+ return std::make_pair((unsigned char*)NULL,"No more records");
if (i + rr.rdlength > (unsigned int)length)
return std::make_pair((unsigned char*)NULL,"Resource record larger than stated");
if (rr.rdlength > 1023)
return std::make_pair((unsigned char*)NULL,"Resource record too large");
+ this->ttl = rr.ttl;
+
switch (rr.type)
{
case DNS_QUERY_CNAME:
res[rr.rdlength] = 0;
break;
}
- return std::make_pair(res,"No error");;
+ return std::make_pair(res,"No error");
}
/** Close the master socket */
DNS::~DNS()
{
- shutdown(this->GetFd(), 2);
- close(this->GetFd());
+ ServerInstance->SE->Shutdown(this, 2);
+ ServerInstance->SE->Close(this);
+ ServerInstance->Timers->DelTimer(this->PruneTimer);
+ delete this->PruneTimer;
+}
+
+CachedQuery* DNS::GetCache(const std::string &source)
+{
+ dnscache::iterator x = cache->find(source.c_str());
+ if (x != cache->end())
+ return &(x->second);
+ else
+ return NULL;
+}
+
+void DNS::DelCache(const std::string &source)
+{
+ cache->erase(source.c_str());
+}
+
+void Resolver::TriggerCachedResult()
+{
+ if (CQ)
+ OnLookupComplete(CQ->data, time_left, true, 0);
}
/** High level abstraction of dns used by application at large */
-Resolver::Resolver(InspIRCd* Instance, const std::string &source, QueryType qt) : ServerInstance(Instance), input(source), querytype(qt)
+Resolver::Resolver(InspIRCd* Instance, const std::string &source, QueryType qt, bool &cached, Module* creator) : ServerInstance(Instance), Creator(creator), input(source), querytype(qt)
{
- ServerInstance->Log(DEBUG,"Instance: %08x %08x",Instance, ServerInstance);
+ cached = false;
+
+ CQ = ServerInstance->Res->GetCache(source);
+ if (CQ)
+ {
+ time_left = CQ->CalcTTLRemaining();
+ if (!time_left)
+ {
+ ServerInstance->Res->DelCache(source);
+ }
+ else
+ {
+ cached = true;
+ return;
+ }
+ }
insp_inaddr binip;
}
if (this->myid == -1)
{
- ServerInstance->Log(DEBUG,"Resolver::Resolver: Could not get an id!");
this->OnError(RESOLVER_NSDOWN, "Nameserver is down");
throw ModuleException("Resolver: Couldnt get an id to make a request");
/* We shouldnt get here really */
return;
}
-
- ServerInstance->Log(DEBUG,"Resolver::Resolver: this->myid=%d",this->myid);
}
/** Called when an error occurs */
-void Resolver::OnError(ResolverError e, const std::string &errormessage)
+void Resolver::OnError(ResolverError, const std::string&)
{
/* Nothing in here */
}
return this->myid;
}
+Module* Resolver::GetCreator()
+{
+ return this->Creator;
+}
+
/** Process a socket read event */
-void DNS::HandleEvent(EventType et)
+void DNS::HandleEvent(EventType, int)
{
- ServerInstance->Log(DEBUG,"Marshall reads: %d",this->GetFd());
/* Fetch the id and result of the next available packet */
- DNSResult res = this->GetResult();
- /* Is there a usable request id? */
- if (res.first != -1)
+ int resultnum = 0;
+ DNSResult res(0,"",0,"");
+ res.id = 0;
+ ServerInstance->Log(DEBUG,"Handle DNS event");
+ while ((res.id & ERROR_MASK) == 0)
{
- /* Its an error reply */
- if (res.first & ERROR_MASK)
+ res = this->GetResult(resultnum);
+
+ ServerInstance->Log(DEBUG,"Result %d id %d", resultnum, res.id);
+
+ /* Is there a usable request id? */
+ if (res.id != -1)
{
- /* Mask off the error bit */
- res.first -= ERROR_MASK;
- /* Marshall the error to the correct class */
- ServerInstance->Log(DEBUG,"Error available, id=%d",res.first);
- if (Classes[res.first])
+ /* Its an error reply */
+ if (res.id & ERROR_MASK)
{
- if (ServerInstance && ServerInstance->stats)
- ServerInstance->stats->statsDnsBad++;
- Classes[res.first]->OnError(RESOLVER_NXDOMAIN, res.second);
- delete Classes[res.first];
- Classes[res.first] = NULL;
+ /* Mask off the error bit */
+ res.id -= ERROR_MASK;
+ /* Marshall the error to the correct class */
+ if (Classes[res.id])
+ {
+ if (ServerInstance && ServerInstance->stats)
+ ServerInstance->stats->statsDnsBad++;
+ Classes[res.id]->OnError(RESOLVER_NXDOMAIN, res.result);
+ delete Classes[res.id];
+ Classes[res.id] = NULL;
+ }
+ break;
}
- }
- else
- {
- /* It is a non-error result */
- ServerInstance->Log(DEBUG,"Result available, id=%d",res.first);
- /* Marshall the result to the correct class */
- if (Classes[res.first])
+ else
{
- if (ServerInstance && ServerInstance->stats)
- ServerInstance->stats->statsDnsGood++;
- Classes[res.first]->OnLookupComplete(res.second);
- delete Classes[res.first];
- Classes[res.first] = NULL;
+ /* It is a non-error result, marshall the result to the correct class */
+ if (Classes[res.id])
+ {
+ if (ServerInstance && ServerInstance->stats)
+ ServerInstance->stats->statsDnsGood++;
+
+ if (!this->GetCache(res.original.c_str()))
+ this->cache->insert(std::make_pair(res.original.c_str(), CachedQuery(res.result, res.ttl)));
+
+ Classes[res.id]->OnLookupComplete(res.result, res.ttl, false, resultnum);
+ delete Classes[res.id];
+ Classes[res.id] = NULL;
+ }
}
+
+ if (ServerInstance && ServerInstance->stats)
+ ServerInstance->stats->statsDns++;
}
- if (ServerInstance && ServerInstance->stats)
- ServerInstance->stats->statsDns++;
+ resultnum++;
}
}
-
+
/** Add a derived Resolver to the working set */
bool DNS::AddResolverClass(Resolver* r)
{
}
}
+void DNS::CleanResolvers(Module* module)
+{
+ for (int i = 0; i < MAX_REQUEST_ID; i++)
+ {
+ if (Classes[i])
+ {
+ if (Classes[i]->GetCreator() == module)
+ {
+ Classes[i]->OnError(RESLOVER_FORCEUNLOAD, "Parent module is unloading");
+ delete Classes[i];
+ Classes[i] = NULL;
+ }
+ }
+ }
+}
+
/** Generate pseudo-random number */
unsigned long DNS::PRNG()
{
gettimeofday(&n,NULL);
val = (n.tv_usec ^ getpid() ^ geteuid() ^ (this->currid++)) ^ s->statsAccept + n.tv_sec;
val = val + s->statsCollisions ^ s->statsDnsGood - s->statsDnsBad;
- val += (s->statsConnects ^ (unsigned long)s->statsSent ^ (unsigned long)s->statsRecv) - s->BoundPortCount;
+ val += (s->statsConnects ^ (unsigned long)s->statsSent ^ (unsigned long)s->statsRecv) - ServerInstance->Config->ports.size();
return val;
}
projects / user / henk / code / inspircd.git / blobdiff